Pump-rod-suspension device



Feb. 7, 1928. 1,658,212

E.E.STEVENSON PUMP ROD SUSPENSION DEVICE Filed Nov. 26. 1924 Ilium/0r.

Edward I. fave/2502a,

Patented Feb. 7, 1928.

UNITED STATES 1,658,212 rarest ()FFICE.

EDV/ARD E. STEVENSON, L053 AI IGELES, CALIFORNIA, ASSIGNOR TO D. 86 B.PUMP AND SUPPLY COMPANY, ()1? LOS ANGELES, CALIFORNIA, A CORPORATION OFCALI- FORNIA.

rnMr-non-snsrnnsmn nnvron.

Application filed November 26, 1924. Serial No. 752,432.

This invention has to (lOWVitll devices for suspending pump rods fromwalking beams, pump jacks and the I the device connecting the upper end.of the polish rod to the free end of the beam or jack to transmitreciprocatory movement of the beam to the pump plunger carried by theline of sucker rods which extend from plunger to polish rod.

One of the common types of suspension devices comprises an arcuatesaddle mounted on top the beam (the axis of the saddle are beingsubstantially parallel to the longitudinal of the beam) and a cabletrained over the saddle and fastened to a clamp or grip on the polishrod. Due to the variable angularity of the walking beam during itsoscillation, the cable has a tendency to bend coinparatively sharply atits points of departure from the saddle and is often cut by the flangeswhich define the saddle groove at said points of departure. Furthermore,there is a decided tendency to bend the polish rod to and fro due to thehorizontal movement of the saddle as the beam swings. about its center.

The above mentioned characteristics are obviously detrimental, and it istherefore the general objectof my invention to provide a suspensiondevice having none of these objectionable characteristics.

it is further an object to provide a simple, effective device which, maybe installed and removed with minimum efiort and expense; in fact, it isso constructed that noattachment tools are needed for positioning thebeam carried portion of thedevice, the bail by which the device iselevated and lowered by usual hoisting tackle being adapted to be like,

7 utilized for positioning purposes.

A. better understanding of the invention will be had from the followingdetailed de scription wherein other features of novelty and objects willbe set forth. Reference will be made to the accompanying drawings, inwhich: 7

Fig. 1 shows my device applied to a walking beam or pump jack, and inconnection with a conventionally illustrated pump;

Fig. 2 is a fragmentary plan view of the free end of a walking beam withthe beam carried portion of my device supported thereon; and

Fig. 3 is a section on line 33 of Fig. 2.

In Fig. l a usual walking beam or pump jack is illustrated at 10, thebeam being adapted to be oscillated by any well known crank means or thelike (not shown). Numeral 11 designates a usual polish rod which extendsabove pump tubing 12 and is connected to a usual pump plunger (notshown) by a line of sucker rods (not shown).

My invention, broadly considered, comprises an equalizing device 13 forsuspending the polish rod and its load fr m the walking beam 10, thedevice comprising a sheave 14 rotatably mounted on the walking beam, ausual grip or clamp 15 removably attached to rod 11, and a cable 16trained over the sheave and attached to clamp 15 at opposite sides ofrod 11. lit will be evident from consideration of the drawings thatduring oscillation of beam 10, cable 16 is free to revolve sheave 14,and that the cable may thus a ljust itself as the angularity of thewalking beam varies. This has the effect of equalizing the strain onopposite sides of clamp 15 so there is practically no tendency to bendthe polish rod to and fro during beam oscil lation. Furthermore, thereis no possibility of the cable being drawn around sharp corners or beingbent backand forth. There fore, it is assured that the useful life ofthe cable will be much longer than that of a cable drawn about astationary, arcuate saddle.

The above description applies to the invention considered in its broaderaspects, and it lies within the scope of my invention as broadly claimedalong these lines to construct the sheave and its mounting in variousmanner. However, I will: now describe the construction of a preferredembodiment of the invention. this construction having variousadvantages, certain of the advan tages being discussed as thedescription progresses and other advantages being of a self-- evidentnature.

The beam carried portion of my device as illustrated comprises sheave14', bail 18 having eyes 19, and shaft 20. Bail 18 is positioned so itstraddles the sheave and so its eyes 19 are in register with the hubbore 21 of sheave 14. In assembling the device, shaft is thrust throughthe bail eyes and hub bore, the bail being free to swing about the shaftwhile sheave 14 is held against longitudinal and rotary movement withrespect to the shaft either by virtue of a force fit between the shaftand sheave hub or by any of the well known keying or set screw means(not shown).

The shaft is adapted to extend transversely across the verticallyextending beam lot 22, which opens to the free end of the beam. Such aslot is customarily provided in every walkingbeam so I do not have toespecially prepare a given beam for the installation of my device.

sheave 14 extends downwardly into slot 22 and the bail eyes 19 are sogaged that they are adapted to contact with the opposite defining; wallsoi the slot to limit movement of the shaft and sheave transversely ofthe beam.

T he ends 24;. or shaft-s 2O extendsufiiciently beyond eyes. 19 toinsure sutiicient bearing; surface on top the beam, and loop of bail 18adapted to be swung over the upstanding projection 26 (e a bolt or lagscrewlon the beam to ililul movement oi the shaft and sheave toward theopen end of slot 22.

l Vhen it is desired to pick up the polish and sucker rods, bail 18swung to vertical position (see dotted lines in Fig. l) and hoistinghook 27 may be attached directly thereto, connection being thus madebetween the suspension device and the usual hoisting Zaclde (not shown)in the derrick. Bail 18 thus serves the dualpurpose of handling elementand a positioning element.

.t is believed afull understanding of the invention will be had from theforegoing, But I wish i to be understood the iDVGIllZlOTI, in itsbroader aspect-s, is not limited to the structure shown and describedexcept for such. limitations as may occur in the broader claims appendedhereto.

lrlaving described a preferred form of my invention, I claim: i

I 1. In a device for suspendinga pump rod from a walking beam, ahorizontal shaft 1'emovably supported on the beam, a sheave on theshaft, and a bail on. the shaft, said bail being. adapted to engage thebeam in a manner to hold the sheave against horizons tal displacementwith respect to the beam.

2. In a device for suspending a pump rod from a walking beam, a shaft, asheave fixed against movement longitudinally along the shaft, and a bailstraddling the sheave and having terminal eyes fitted over the shaft atopposite sides of the sheave, the ends of said shatt extending anappreciable distance beyond said bail eyes and being adapted to havebearing on the beam.

In a device for suspending;- a pump rod from a walking beam which has avertical slot extending tnerethrough, and opening to the end of thebeam, a horizontal shaft bearing on lop the beam and extendingtransversely thereof across the slot, a sheave fixed against movementlongitudinally along the shaft and extending downwardly into the beamslot, a bail straddling the sheave and having terminal eyes fitted overthe shaft at opposite. side of: the, sheave, said eyes being adapted toor end oppos 0 sides thereof to limit. move in it l ft transversely of,the beam,

and means for limiting movemento'f the shaft longitudinally alongthebeam towards the open end otlhe slot.

4%. In aservice for suspending a pump rod from walking beam which has avertical slotentending therethrough, and opening to the end or" thebeam, a horizontal shaft hearing on top the beam and extendingtransversely t-hereof across the slot, a sheave fixed against movementlongitudinally along the shaft and extending downwardly into the beamslot, a bail straddling the sheave and having; terminal eyesl'itted overthe shaft at opposite sides of the sheave, said. eyes being .o the beamslot and en adapted toex'tend into the beam slot and engage oppositesides thereof to limit movement of the shai't transversely of the beam.the loop of the bail being adapted'to embrace an upstanding projectionon top the beam for limiting movement of the shaft longitudinally alongthe beam towards the open end of the slot.

In, witness that I claim the foregoing I have hereunto subscribed myname this 20th day of Nov, 1924.

EDWARD n. STEVENSON.

